Shielded tube-in-pump

Abstract

The application discloses a shielding type pipe-in-pump, which comprises a pump sleeve pipe, a submersible motor and a multi-stage pump body. The pump sleeve pipe comprises a pump pipe, a water inlet connecting seat and a water outlet connecting seat. The submersible motor comprises a stator, a rotor, an upper bearing seat, a lower bearing seat, a motor shell, an upper bearing, a lower bearing, a cable leading-out assembly and a non-magnetic shielding sleeve. Upper end rings and lower end rings are welded at the two ends of the motor shell. The non-magnetic shielding sleeve is fixed between the upper end rings and the lower end rings and an air gap exists between the non-magnetic shielding sleeve and the rotor. The space surrounded by the motor shell, the non-magnetic shielding sleeve, the upper end rings and the lower end rings is filled with insulating sealing glue to shield the stator. The upper bearing comprises an upper sliding bearing and a thrust bearing, which are fixed on the upper end rings and are arranged in the upper bearing seat. The lower bearing is a sliding bearing, which is arranged in the lower bearing seat and is fixed below the lower end rings. The lower bearing seat is provided with a water inlet center hole and a water inlet channel, and a lower cover with a water filtering hole. The application has the beneficial effects of internal and external water circulation, enhanced lubrication and heat dissipation, prolonged product life and horizontal installation.

Description

TECHNICAL FIELD

[0001] The present application relates to a canned pump, in particular to a canned pump. BACKGROUND

[0002] In the prior art, the canned pump comprises a pump sleeve, a submersible motor and a multi-stage pump body fixedly installed in the pump sleeve, the pump sleeve comprises a pump pipe and a water inlet connecting seat and a water outlet connecting seat fixedly installed at both ends of the pump pipe respectively, a water outlet of the multi-stage pump body is connected to the water outlet connecting seat, a tail of the submersible motor is fixed to an inner wall of the pump pipe, the submersible motor is configured as an oil-filled submersible motor or a water-filled submersible motor, the oil-filled submersible motor can be installed vertically or horizontally, but oil leakage may affect water quality. The water-filled submersible motor structure can only be installed vertically, and cannot be installed horizontally. The water-filled submersible motor comprises a stator, a rotor, an upper bearing seat, a lower bearing seat, a motor shell, an upper bearing and a lower bearing, and a cable lead assembly. The stator is fixed to an inner wall of the motor shell. An upper end ring and a lower end ring are respectively welded to inner walls at both ends of the motor shell. A non-magnetic shielding sleeve is fixed between central ring holes of the upper end ring and the lower end ring. The non-magnetic shielding sleeve is attached to an inner wall of the stator, and an air gap exists between the non-magnetic shielding sleeve and the rotor. The space surrounded by the motor shell, the non-magnetic shielding sleeve, the upper end ring and the lower end ring is filled with insulating sealing glue to completely shield the stator. The lower bearing of the motor is a thrust bearing installed inside the motor below the rotor shaft. The thrust bearing comprises a friction pair dynamic ring installed at a lower end of the rotor shaft and a friction pair static ring installed in the lower bearing seat. The friction pair static ring base adopts a semi-spherical centering structure. The motor is not suitable for horizontal installation, which limits the use range of the canned pump. The thrust bearing relies on water stored inside the motor for lubrication and heat dissipation. When the motor runs for a long time, a small amount of water inside the motor may leak out due to the centrifugal pressure. When the amount of water inside the motor decreases to a certain extent, the amount of lubricating water at the center of the centrifugal force generated by the motor rotation also decreases, which causes poor lubrication and poor heat dissipation, and easily causes the motor to burn, thereby reducing the service life. Therefore, it is necessary to solve the technical problem of finding a water-filled submersible motor that can be installed horizontally without pollution, can enhance water lubrication and heat dissipation, and can improve the service life of the thrust bearing and the service life of the motor and the product. SUMMARY

[0003] The present application aims to provide a canned pump with a water-filled submersible motor that can be installed horizontally without pollution, can enhance water lubrication and heat dissipation, and can improve the service life of the thrust bearing and the service life of the motor and the product.

[0004] The technical scheme of the shielding type pipe-in-pump of the present application is: comprising a pump sleeve pipe, a submersible motor and a multi-stage pump body fixedly installed in the pump sleeve pipe, the pump sleeve pipe comprising a pump pipe and a water inlet connecting seat and a water outlet connecting seat fixedly installed at both ends of the pump pipe respectively, the water outlet of the multi-stage pump body being connected to the water outlet connecting seat, the tail of the submersible motor being fixed to the inner wall of the pump pipe by means of a support, wherein the submersible motor comprises a stator, a rotor, an upper bearing seat, a lower bearing seat, a motor shell, an upper bearing and a lower bearing, further comprising a cable lead-out assembly and a non-magnetic shielding sleeve, the stator being fixed to the inner wall of the motor shell, the inner wall of both ends of the motor shell being welded with an upper end ring and a lower end ring respectively, the non-magnetic shielding sleeve being fixed between the central ring hole of the upper end ring and the lower end ring respectively, the non-magnetic shielding sleeve being attached to the inner wall of the stator, and there being an air gap between the non-magnetic shielding sleeve and the rotor, the space surrounded by the motor shell, the non-magnetic shielding sleeve, the upper end ring and the lower end ring being filled with insulating sealant to completely shield the stator, the lower bearing being a sliding bearing installed in the lower bearing seat, the lower bearing seat being fixed below the lower end ring, the lower bearing seat having a water inlet central hole and a water inlet channel leading to the space where the rotor is located around the periphery of the lower bearing, and a lower cover with a water filtering hole being fixed to the outer end of the water inlet central hole, the features being that the upper bearing comprises an upper sliding bearing and a thrust bearing, the upper sliding bearing being installed in the shaft hole position of the upper bearing seat of the motor, and the thrust bearing being installed on the outer end surface of the upper bearing seat of the motor, the upper bearing seat being fixed to the upper end ring, and the thrust bearing comprising a friction pair static ring fixed to the upper surface of the upper bearing seat and a sliding disc installed on the output shaft of the rotor of the motor, the sliding disc comprising a bottom disc and a friction pair dynamic ring, the bottom disc being fixed to the output shaft of the rotor of the motor, and the friction pair dynamic ring being fixed inside the bottom disc, and the friction surface of either the friction pair static ring or the friction pair dynamic ring having circumferentially distributed radial water guide lubrication grooves.

[0005] As one of the preferred technical schemes of the present application, the radial water guide lubrication groove is a radial arc-shaped water guide lubrication groove.

[0006] As the second preferred technical scheme of the present application, the friction surface of the friction pair static ring has circumferentially spaced sliding blocks, the spacing channels of the sliding blocks being radial water guide lubrication grooves, and the friction surface of the friction pair dynamic ring being smooth.

[0007] As the third preferred technical scheme of the present application, the bottom disc is coupled with the output shaft of the rotor of the motor through a key, and an axial locking nut is further installed on the output shaft of the rotor of the motor, the axial locking nut axially locking the bottom disc.

[0008] As the fourth preferred technical scheme of the present application, the upper sliding bearing comprises an upper bearing bush fixed to the upper bearing seat and an upper shaft sleeve fixed to the shaft of the rotor.

[0009] As the fifth preferred technical scheme of the present application, a limiting sliding support seat is fixed to the rotor shaft below the upper shaft sleeve, the limiting sliding support seat comprises a support seat and a wear-resistant ring embedded in the support seat, and the inner ring of the support seat limits the upper shaft sleeve in the axial direction and the wear-resistant ring is limited by the upper bearing bush in the axial direction.

[0010] As the sixth preferred technical scheme of the present application, the inner wall of the shaft hole of the upper bearing bush has a spiral water guide lubricating groove.

[0011] As the seventh preferred technical scheme of the present application, the lower bearing comprises a lower bearing bush fixed to the lower bearing seat and a lower shaft sleeve fixed to the rotor shaft.

[0012] As the eighth preferred technical scheme of the present application, an axial locking nut is installed at the end of the rotor shaft below the lower shaft sleeve.

[0013] As the ninth preferred technical scheme of the present application, the inner wall of the shaft hole of the lower bearing bush has a spiral water guide lubricating groove.

[0014] The present application has the beneficial effects that the submersible motor is a water-filled submersible motor, the thrust bearing is installed above the upper bearing seat of the motor, is located at the position of the external shaft above the motor, the multi-stage pump body is connected to the upper bearing seat of the motor, and the position is also the water inlet position during the operation of the water pump. During the operation of the water pump, water flows through the friction pair, the rotating dynamic ring of the friction pair rotates with the rotor shaft, water is brought into the static ring of the friction pair for lubrication and cooling, the external water flow is fast, and the heat generated by the friction pair is quickly taken away to achieve rapid heat dissipation. In addition, the water inlet central hole, the water inlet channel and the filter hole of the lower cover form a water circulation channel inside and outside the motor, the circulation of the external water flow in and out forms the internal and external circulation, the lubrication and heat dissipation effects are better, the upper bearing and the lower bearing at the two ends of the rotor of the motor are both supported by sliding bearings, and the thrust bearing is fixed, so that the motor can be installed horizontally, and the use range is expanded. The water-filled submersible motor of the present application can be installed horizontally, has no pollution, can enhance the water lubrication and heat dissipation effects, has the beneficial effects of prolonging the service life of the thrust bearing and the service life of the motor and the product. BRIEF DESCRIPTION OF DRAWINGS

[0015] The shielded in-line pump of the present application will be described in more detail below with reference to the accompanying drawings.

[0016] Figure 1 is a sectional view of the shielded in-line pump of the present application.

[0017] Figure 2 is a sectional view of the submersible motor in the shielded in-line pump of the present application.

[0018] Figure 3 is a top view of the submersible motor in the shielded in-line pump of the present application.

[0019] Figure 4 is the bottom view of the submersible motor in the shielded in-line pump of the present application.

[0020] Figure 5 is the sectional view of the stator assembly of the submersible motor in the shielded in-line pump of the present application.

[0021] Figure 6 is the sectional view of the upper bearing installation of the submersible motor in the shielded in-line pump of the present application.

[0022] Figure 7 is the sectional view of the thrust bearing installation of the submersible motor in the shielded in-line pump of the present application.

[0023] Figure 8 is the structural schematic diagram of the inner radial water guide lubrication groove of the friction pair of the thrust bearing of the submersible motor in the shielded in-line pump of the present application.

[0024] Figure 9 is the structural schematic diagram of the inner sliding block of the friction pair of the thrust bearing of the submersible motor in the shielded in-line pump of the present application.

[0025] Figure 10 is the sectional view of the A-A of Figure 1 .

[0026] Figure 11 is the bottom view of the lower bearing seat of the submersible motor in the shielded in-line pump of the present application.

[0027] Figure 12 is the front view of the lower cover of the submersible motor in the shielded in-line pump of the present application.

[0028] Figure 13 is the sectional view of the inner wall of the shaft hole of the upper bearing bush and the lower bearing bush of the submersible motor in the shielded in-line pump of the present application.

[0029] Figure 14 is the sectional view of the limiting sliding support seat of the submersible motor in the shielded in-line pump of the present application.

[0030] Figure 15 is the top view of Figure 14 .

[0031] Figure 16 is the bottom view of Figure 14 .

[0032] The diagram shows: pump sleeve 20, pump pipe 21, inlet connector 22, outlet connector 23, bracket 24, submersible motor 01, multistage pump body 02, stator 1, rotor 2, upper bearing seat 3, lower bearing seat 4, inlet center hole 41, inlet channel 42, filter hole 43, lower cover 44, motor housing 5, upper end ring 51, lower end ring 52, upper bearing 6, upper sliding bearing 61, upper bearing bush 611, upper bushing 612, and limit sliding support seat. 613, support seat 6131, wear-resistant ring 6132, thrust bearing 62, friction pair stationary ring 621, radial water-guiding lubrication groove 6211, slider 6212, sliding disk 622, chassis 6221, friction pair moving ring 6222, axial locking nut 623, lower bearing 7, lower bearing bush 71, lower bushing 72, axial set nut 73, cable lead-out assembly 8, non-magnetic shielding sleeve 9, insulating sealant 10, spiral water-guiding lubrication groove 11. Detailed Implementation

[0033] Depend on Figures 1 to 16 As shown, the embodiment of the shielded in-pipe pump of the present invention includes a pump sleeve 20 and a submersible motor 01 and a multi-stage pump body 02 fixedly installed inside the pump sleeve 20. The pump sleeve 20 includes a pump pipe 21 and an inlet connector 22 and an outlet connector 23 respectively fixed at both ends of the pump pipe 21. The outlet of the multi-stage pump body 02 is connected to the outlet connector 23. The tail of the submersible motor 01 is fixed to the inner wall of the pump pipe 21 by a bracket 24. The inlet connector 22 and the outlet connector 23 can be designed according to the connection method. In this embodiment, a flange connection structure is adopted. The submersible motor 01 is a water-filled submersible motor, which includes a stator 1, a rotor 2, an upper bearing seat 3, a lower bearing seat 4, a motor housing 5, an upper bearing 6, and a lower bearing 7. It also includes a cable lead-out assembly 8 and a non-magnetic shielding sleeve 9. The stator 1 is fixed to the inner wall of the motor housing 5. An upper end ring 51 and a lower end ring 52 are welded to the inner walls at both ends of the motor housing 5, respectively. Figure 2 , 5 As shown, the two ends of the non-magnetic shielding sleeve 9 are respectively fixed between the central annular holes of the upper ring 51 and the lower ring 52, and can be fixed by welding. The non-magnetic shielding sleeve 9 is attached to the inner wall of the stator 1, and there is an air gap between it and the rotor 2. Figure 2 As shown, the space enclosed by the motor housing 5, the non-magnetic shielding sleeve 9, the upper ring 51, and the lower ring 52 is filled with insulating sealant 10 to completely shield the stator 1. Figure 2 , 6 As shown in Figures 7 and 8, the upper bearing 6 includes an upper sliding bearing 61 and a thrust bearing 62. The upper sliding bearing 61 is installed at the shaft hole position of the upper bearing housing 3 of the motor. Figure 2 , 3, 6, 7, the thrust bearing 62 is installed in the outer end surface of the upper bearing seat 3, the upper bearing seat 3 is fixed on the upper end ring 51, the lower bearing 7 is a sliding bearing, which is installed in the lower bearing seat 4, the lower bearing seat 4 is fixed below the lower end ring 52, and the lower end ring 52 is fixed on the lower end ring 52 Figure 11 , the lower bearing seat 4 has a water inlet center hole 41, and a water inlet passage 42 is formed around the lower bearing 7 and enters the space of the rotor 2 Figure 2 , 4 , 12, a lower cover 44 with a water filter hole 43 is fixed on the outer end of the water inlet center hole 41. In this embodiment, the lower cover 44 is made of 304 stainless steel Figure 2 , 5 , the non-magnetic shielding sleeve 9 can be made of 304 stainless steel, and the two ends are welded to the inner wall of the central ring hole of the upper end ring 51 and the lower end ring 52, respectively. The inner diameter of the central ring hole of the upper end ring 51 and the lower end ring 52 is the same as the inner diameter of the stator 2. An injection process hole can be provided on the upper end ring 51 or the lower end ring 52 for pouring insulating sealant 10 Figure 2 , 6 ~ 9, the thrust bearing 62 is a flat thrust bearing, which is arranged at the outer shaft position of the motor, which is also the water inlet position of the water pump during operation. When the water pump is running, water flow will be attracted to lubricate and cool the thrust bearing 62. The external water flow is fast, which can quickly take away the heat generated during operation, and the heat dissipation is fast Figure 2 , the water inlet center hole 41, the water inlet passage 42 and the water filter hole 43 of the lower cover 44 together form a circulating water passage inside and outside the motor, and the external water flow forms an internal and external circulation, which can improve the lubrication and heat dissipation effect. Since the upper bearing 6 and the lower bearing 7 at both ends of the rotor of the motor are supported by sliding bearings, and the thrust bearing 62 is fixed, it can be installed horizontally, which expands the use range. The water-filled submersible motor can be installed horizontally, which has no pollution and can enhance the water lubrication and heat dissipation effect, and has the beneficial effect of prolonging the service life of the thrust bearing and the motor and the product Figure 2 , 3, 6-9, the thrust bearing 62 comprises a friction pair static ring 621 fixed on the upper bearing seat 3 and a sliding disc 622 installed on the motor rotor output shaft, the sliding disc 622 comprises a base disc 6221 and a friction pair dynamic ring 6222, the base disc 6221 is fixed on the motor rotor 2 output shaft, the friction pair dynamic ring 6222 is fixed inside the base disc 6221, the friction surface of either the friction pair static ring 621 or the friction pair dynamic ring 6222 is provided with circumferentially distributed radial water guide lubrication grooves 6211. In the embodiment, the friction pair static ring 621 can be fixed on the upper bearing seat 3 by means of screws or interference fit or concave-convex embedding, the friction pair dynamic ring 6222 can also be fixed inside the base disc 6221 by means of screws or interference fit or concave-convex embedding, the friction pair static ring 621 and the friction pair dynamic ring 6222 should be made of materials with high hardness and wear resistance, for example, made of silicon carbide sintering. Figures 8 to 9 As shown in FIG. 6-9, the radial water guide lubrication grooves 6211 are preferably arranged on the friction pair static ring 621, the radial water guide lubrication grooves 6211 can be designed to be radially distributed around the center, and a small amount of lubricating water can be stored in the radial water guide lubrication grooves 6211, so as to reduce the starting resistance, prevent the adhesion between the friction pairs, enhance the water lubrication effect, and attract water flow when the water pump is running, so that the friction pair dynamic ring rotates with the rotor shaft to bring water into the friction pair static ring for lubrication and cooling. The external water flow is fast, so as to quickly take away the heat generated by the friction pairs, and the heat dissipation is fast, thereby prolonging the service life of the thrust bearing.

[0034] As shown in FIG. 6-9, the radial water guide lubrication grooves 6211 are preferably arranged on the friction pair static ring 621, the radial water guide lubrication grooves 6211 can be designed to be radially distributed around the center, and a small amount of lubricating water can be stored in the radial water guide lubrication grooves 6211, so as to reduce the starting resistance, prevent the adhesion between the friction pairs, enhance the water lubrication effect, and attract water flow when the water pump is running, so that the friction pair dynamic ring rotates with the rotor shaft to bring water into the friction pair static ring for lubrication and cooling. The external water flow is fast, so as to quickly take away the heat generated by the friction pairs, and the heat dissipation is fast, thereby prolonging the service life of the thrust bearing. Figure 8 As shown in FIG. 6-9, the radial water guide lubrication grooves 6211 are preferably arranged on the friction pair static ring 621, the radial water guide lubrication grooves 6211 can be designed to be radially distributed around the center, and a small amount of lubricating water can be stored in the radial water guide lubrication grooves 6211, so as to reduce the starting resistance, prevent the adhesion between the friction pairs, enhance the water lubrication effect, and attract water flow when the water pump is running, so that the friction pair dynamic ring rotates with the rotor shaft to bring water into the friction pair static ring for lubrication and cooling. The external water flow is fast, so as to quickly take away the heat generated by the friction pairs, and the heat dissipation is fast, thereby prolonging the service life of the thrust bearing.

[0035] As shown in FIG. 6-9, the radial water guide lubrication grooves 6211 are preferably arranged on the friction pair static ring 621, the radial water guide lubrication grooves 6211 can be designed to be radially distributed around the center, and a small amount of lubricating water can be stored in the radial water guide lubrication grooves 6211, so as to reduce the starting resistance, prevent the adhesion between the friction pairs, enhance the water lubrication effect, and attract water flow when the water pump is running, so that the friction pair dynamic ring rotates with the rotor shaft to bring water into the friction pair static ring for lubrication and cooling. The external water flow is fast, so as to quickly take away the heat generated by the friction pairs, and the heat dissipation is fast, thereby prolonging the service life of the thrust bearing. Figure 9 As shown in FIG. 6-9, the radial water guide lubrication grooves 6211 are preferably arranged on the friction pair static ring 621, the radial water guide lubrication grooves 6211 can be designed to be radially distributed around the center, and a small amount of lubricating water can be stored in the radial water guide lubrication grooves 6211, so as to reduce the starting resistance, prevent the adhesion between the friction pairs, enhance the water lubrication effect, and attract water flow when the water pump is running, so that the friction pair dynamic ring rotates with the rotor shaft to bring water into the friction pair static ring for lubrication and cooling. The external water flow is fast, so as to quickly take away the heat generated by the friction pairs, and the heat dissipation is fast, thereby prolonging the service life of the thrust bearing.

[0036] As shown in FIG. 6-9, the radial water guide lubrication grooves 6211 are preferably arranged on the friction pair static ring 621, the radial water guide lubrication grooves 6211 can be designed to be radially distributed around the center, and a small amount of lubricating water can be stored in the radial water guide lubrication grooves 6211, so as to reduce the starting resistance, prevent the adhesion between the friction pairs, enhance the water lubrication effect, and attract water flow when the water pump is running, so that the friction pair dynamic ring rotates with the rotor shaft to bring water into the friction pair static ring for lubrication and cooling. The external water flow is fast, so as to quickly take away the heat generated by the friction pairs, and the heat dissipation is fast, thereby prolonging the service life of the thrust bearing. Figure 2 , 6As shown in Figure 7, a third preferred embodiment of the present invention is as follows: the chassis 621 is connected to the output shaft of the motor rotor 2 via a key, and an axial locking nut 623 is also installed on the output shaft of the motor rotor 2, which axially locks the chassis 6221. In this embodiment, the key connection can be a flat key or a spline key, which allows the chassis 6221 to move axially to adjust the friction pair clearance and maintain the optimal lubrication film.

[0037] Depend on Figure 2 , 6 As shown in Figures 7 and 8, a preferred embodiment of the present invention is as follows: the upper sliding bearing 61 includes an upper bearing shell 611 fixed to the upper bearing seat 3 and an upper bushing 612 fixed to the rotor shaft. In this embodiment, the upper bearing shell 611 and the upper bushing 612 can be made of wear-resistant hard materials, such as silicon carbide sintering.

[0038] Depend on Figure 2 , 6 As shown in Figures 14-16, a fifth preferred embodiment of the present invention includes a limiting sliding support 613 fixed to the rotor shaft below the upper bushing 612. The limiting sliding support 613 includes a support 6131 and a wear-resistant ring 6132 embedded therein. The inner ring of the support 6131 axially limits the upper bushing 612, and the wear-resistant ring 6132 is axially limited by the upper bearing shell 611. In this embodiment, the limiting sliding support 613 rotates with the rotor 2, precisely limiting the axial movement of the motor rotor shaft and reducing noise caused by increased axial movement of the rotor shaft due to wear. It also prevents external sand particles from entering the upper sliding bearing 61. The wear-resistant ring 6132 can be made of a wear-resistant hard material, such as silicon carbide sintering. The wear-resistant ring 6132 can be glued and embedded in the support 6131 with waterproof adhesive.

[0039] Depend on Figure 13 As shown, in a sixth preferred embodiment of the present invention, the inner wall of the shaft hole of the upper bearing 611 has a spiral water-guiding lubrication groove 11. In this embodiment, the spiral water-guiding lubrication groove 11 allows external water to enter, which, when the rotor rotates, pulls out a lubricating water film, thereby enhancing the lubrication effect and improving the bearing life.

[0040] Depend on Figure 2 As shown, a seventh preferred embodiment of the present invention is: the lower bearing 7 includes a lower bearing shell 71 fixed on the lower bearing seat 4 and a lower bushing 72 fixed on the rotor shaft. In this embodiment, the lower bearing shell 71 and the lower bushing 72 can be made of wear-resistant hard materials, such as silicon carbide sintering.

[0041] Depend on Figure 2As shown in Fig. 8, as the eighth preferred embodiment of the present application, an axial locking nut 73 is installed at the end of the rotor shaft below the lower shaft sleeve 72. In this embodiment, the axial locking nut 73 positions the rotor shaft axially and prevents external sand from entering the lower bearing 7.

[0042] By Figure 13 As shown in Fig. 9, as the ninth preferred embodiment of the present application, the inner wall of the shaft hole of the lower bearing bush 71 has a spiral water guide lubrication groove 11. In this embodiment, the spiral water guide lubrication groove 11 allows external water to enter and pull out a lubricating water film when the rotor rotates, enhancing the lubrication effect and prolonging the bearing life.

[0043] The above description is only the preferred embodiments of the present application and does not constitute a limitation on the scope of protection of the present application. As long as the purpose of the present application is achieved by basically the same means, it should belong to the scope of protection of the present application.

Claims

1. A shielded in-pipe pump, comprising a pump casing and a submersible motor and a multi-stage pump body fixedly installed within the pump casing. The pump casing includes a pump pipe and an inlet connector and an outlet connector fixed at both ends of the pump pipe, respectively. The outlet of the multi-stage pump body is connected to the outlet connector. The tail end of the submersible motor is fixed to the inner wall of the pump pipe by a bracket. The submersible motor includes a stator, a rotor, an upper bearing housing, a lower bearing housing, a motor housing, and upper and lower bearings. It also includes a cable lead assembly and a non-magnetic shielding sleeve. The stator is fixed to the inner wall of the motor housing. An upper end ring and a lower end ring are welded to the inner walls at both ends of the motor housing, respectively. The non-magnetic shielding sleeve is fixed at both ends between the central ring holes of the upper and lower rings, respectively. This non-magnetic shielding sleeve adheres to the inner wall of the stator, with an air gap between it and the rotor. The space enclosed by the motor housing, the non-magnetic shielding sleeve, the upper ring, and the lower ring is filled with insulating sealant to completely shield the stator. The upper bearing seat is fixed to the upper ring, and the lower bearing is a sliding bearing installed in the lower bearing seat, which is fixed below the lower ring. The lower bearing seat has a central water inlet hole and a water inlet channel surrounding the lower bearing, leading into the space where the rotor is located. A lower cover with a filter hole is fixed at the outer end of the central water inlet hole. The feature is: The upper bearing includes an upper sliding bearing and a thrust bearing. The upper sliding bearing is installed in the shaft hole of the motor upper bearing housing, and the thrust bearing is installed on the outer end face of the motor upper bearing housing. The thrust bearing includes a friction pair stationary ring fixed on the upper bearing housing and a sliding disc installed on the output shaft of the motor rotor. The sliding disc includes a base and a friction pair moving ring. The base is fixed on the output shaft of the motor rotor, and the friction pair moving ring is fixed inside the base. Either the friction surface of the friction pair stationary ring or the friction pair moving ring has circumferentially distributed radial water-guiding lubrication grooves.

2. The shielded in-line pump according to claim 1, characterized in that: The radial water-guiding lubrication groove is a radial arc-shaped water-guiding lubrication groove.

3. The shielded in-line pump according to claim 1, characterized in that: The stationary ring of the friction pair has circumferentially spaced sliders on its friction surface, and the spacing channels of the sliders are radial water-guiding lubrication grooves. The friction surface of the moving ring of the friction pair is smooth.

4. The shielded in-line pump according to claim 1, characterized in that: The chassis is connected to the motor rotor output shaft by a key, and an axial locking nut is also installed on the motor rotor output shaft to lock the chassis axially.

5. The shielded in-line pump according to claim 1, characterized in that: The upper sliding bearing includes an upper bearing shell fixed to the upper bearing housing and an upper bushing fixed to the rotor shaft.

6. The shielded in-line pump according to claim 5, characterized in that: Below the upper bushing, there is a limiting sliding support fixed on the rotor shaft. The limiting sliding support includes a support seat and a wear-resistant ring embedded therein. The inner ring of the support seat axially limits the upper bushing, and the wear-resistant ring is axially limited by the upper bearing.

7. The shielded in-line pump according to claim 5, characterized in that: The inner wall of the shaft hole of the upper bearing bush has a spiral water-guiding lubrication groove.

8. The shielded in-line pump according to claim 1, characterized in that: The lower bearing includes a lower bearing shell fixed on the lower bearing seat and a lower bearing sleeve fixed on the rotor shaft.

9. The shielded in-line pump according to claim 8, characterized in that: Below the lower bushing, there is also an axial set nut mounted on the end of the rotor shaft.

10. The shielded in-line pump according to claim 8, characterized in that: The inner wall of the shaft hole of the lower bearing bush has a spiral water-guiding lubrication groove.

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